Im not talking about extremes like that. Corruption doesn't mean MC must become a crazed sex addict.
For example, I would bring "A wife and Mother" where the MC slowly starts to enjoy the lustful rushes she feels in certain scenes. That is of course if the player chooses so. What I mean by corruption is there has to be some sort of vice involved.
"She is willing to do something she doesn't want/like for a benefit" How can that portray corruption. That would mean everyone who has to get up early in the morning to go to work and get paid are being corrupted.
"Could Monica from Episode 1 even imagine herself dancing completely naked in some cheap bar or sucking dicks on the street? Certainly not. But it is acceptable for her in Episode 2."
That's what I mean. She (by player choice) does these things but she herself remains the same since the start of ep1. Reading her internal dialogue given the chance she wouldn't do any of these things and probably make them suffer for having been forced to do them. Those things you guys described fall under humiliation, blackmail, rape and such